Linkdump

Might be current when Posted, might be some obscure bit I happened across...  an odd lot of references, downloads, idea seeds.  :)

http://hackslashmaster.blogspot.com/p/trick-trap-index.html
The Thursday Trick & Trap Agency Series index
This series examines original and classic traps discussing how to present the traps while maintaining the agency of the players.
 

 https://middenmurk.blogspot.com/2019/02/outlandish-weapons.html
https://rpg.stackexchange.com/questions/2089/what-are-the-differences-between-holmes-moldvay-and-mentzer-dd
https://lingojam.com/EnglishtoVulcanTranslator
https://lingojam.com/RunicTranslator

cool art
https://www.deviantart.com/tillinghast23/gallery/
https://stefanpoag.com/ 
http://oldschoolfrp.tumblr.com/
https://laughingsquid.com/mike-bukowski-drawing-all-of-h-p-lovecrafts-creatures/
 
5E:
http://ceryliae.github.io/5edmscreen/index
https://drive.google.com/file/d/0ByygadYbYgkHSHV0WGowbGNmTTA/view
http://zerohitpoints.com/Articles/Advantage-in-DnD-5    Probability and the new Advantage mechanic
https://www.reddit.com/r/DnD/comments/7nq65f/massive_dms_toolkit_5e_resources/

Hey there kids, this is Ivan:
https://www.youtube.com/channel/UCZDQPUaSpnEFnON4S9oxhwA

MAPS!   free, high quality maps
https://daisandcolumn.wordpress.com/tag/map/
https://jaspersrantings.wordpress.com/
http://paratime.ca/cartography/index.html
http://www.theweem.com/2012/02/caves-of-chaos-reimagined-by-weem/
https://www.theskyfullofdust.co.uk/ 

AD&D 1st Ed Spells online index
http://pandaria.rpgworlds.info/cant/rules/adnd_spells.htm

Trampier Wormy Archive
https://sites.google.com/site/wormycollected/Home
https://billcoffin.files.wordpress.com/2014/03/wormy.pdf

Jason Thompson's walkthrough maps of classic adventures, good fun!  http://rendedpress.blogspot.com/2016/11/list-of-d-module-walkthrough-maps-by.html

cool beasties
http://theystalktheunderworld.blogspot.com/2014/12/transplanar-observer.html

awesome viking/alien/D&D adventure locale
http://dreamsinthelichhouse.blogspot.com/p/black-city-project.html  

new, but somehow still useful and cool, magic items
http://recedingrules.blogspot.com/2014/12/6-solo-magical-treasures.html 

Ack!  Ack-ack!
http://oldschoolheretic.blogspot.com/2011/04/principles-of-martian-technology-some.html

huge list of largely free retroclone games
http://taxidermicowlbear.weebly.com/dd-retroclones.html

"Excellent gaming stuff for free"; full page of various rpg links
http://gothridgemanor.blogspot.com/p/excellent-gaming-stuff-for-free.html

very simple, easy, cool psionics system, one page
https://mutantsmagic.wordpress.com/character-creation/character-class/psionicist/psionic-powers/

all the hex-fillers you'll ever need
http://www.onepagedungeon.info/

misc downloads; dungeons, adventures...  

http://towerofthearchmage.blogspot.com/p/downloads.html

The Tower of the Changer.pdf   truly love this one-page adv!
http://www.mediafire.com/view/?z3vx131i8civvl1

RPG type Pins
https://www.pinterest.com/pmshope/fantasy-artifacts/

Wikipedia!!!
http://en.wikipedia.org/wiki/List_of_discredited_substances
https://en.wikipedia.org/wiki/Category:Mythological_substances
https://en.wikipedia.org/wiki/List_of_fictional_toxins
 http://en.wikipedia.org/wiki/Thagomizer 
 https://en.wikipedia.org/wiki/List_of_mythological_objects 
https://en.wikipedia.org/wiki/Astra_%28weapon%29
 https://en.wikipedia.org/wiki/List_of_Doctor_Who_items

Minerals
http://geology.com/gemstones/gems/
https://olddungeonmaster.com/2012/06/10/gems/

Crapload of Free Adventures
https://rpgcharacters.wordpress.com/maps/adventures/
https://dysonlogos.blog/maps/adventures/ 

Character Sheets
 http://taxidermicowlbear.weebly.com/downloads.html
 http://www.mad-irishman.net/pub_dnd_1e.html#1e_sheet_10

Crapload of Random Tables
 http://hackslashmaster.blogspot.com.au/2011/03/on-never-being-able-to-find-table-when.html

Gamma World 1st ed Mutations PDF
https://drive.google.com/file/d/0B2qlP_VOf718OXRWdnp0X2NrRUU/view

Campaign/System-Adaptable Tekumel Magic Items
http://www.weirdrealm.com/tekumel/gurps/item.html
 http://www.tekumel.com/gaming_advTNE.html

Sword and Planet Resource Links
http://joyfulsitting.blogspot.com/p/sword-and-planet-resources.html

Enter search terms to find related  TSR/Wiz o' Coast published Adv Modules
https://adventurelookup.com/adventures/

weird/cool magic items
https://docs.google.com/document/d/1BONVbAJzybPvQomDr3uNuabyqVCEylNLk3GEAo7lJYk/edit

 https://campaignwiki.org/wiki/LinksToWisdom/HomePage

Vancian Vancian Spells, very cool

https://www.scribd.com/document/102667796/Dying-Earth-Spells-for-D-D

One Loot Table to rule them all
https://docs.google.com/spreadsheets/d/1lIKwMVNbJLTE8b5iHbhEMFef8o7WuVsy1s0-I0k3ohA/edit#gid=0